Let’s cut to brass tacks: there’s a spray out there that will make whatever you spray it on immune to water and other fluids. Seriously.
Okay, a less silly way to put that is this: NeverWet is a superhydrophobic spray. You can apply it to a number of surfaces (concrete, cotton, glass, all kinds of stuff), and then those surfaces will then repel water. Check out the video below; it’s like magic.
So, where can you buy this miracle product? So far, at Home Depot in the States. However, there is a movement to bring the product here, and crafty Americans have set up a lucrative market for the stuff on eBay.